Marine inboard motor power unit



{ 2 April 4, 1961 K. A. BERGSTEDT 2,977,923

MARINE INBOARD MOTOR POWER UNIT Filed March 24, 1959 INVENTOR BY y" APTTORNEYS toward said. groove. I substantially parallel to the side faces. of the flange 9.

shaft 15 of the motor is "16,: Outside the bea'ring'the: output shaft is connected to I .ingan opening therein coinciding With an opemng in said Units States. P w

Karl AbdonBergstedt, Goteborg, swedena assig'rior to Alifiebolage'ti Pent-a ;Goteborg iswedeny a: corporation This invention relates to a marine inboard motor power unit in which the output shaft of the motor extendshorizontally or substantially horizontally through the stern of the boat and is connected to a transmission gear.

housed in a gear case andcomprising two bevel gearings and an intermediate vertical shaft to transmit the motor output to a propeller.

The main object of the invention is to provide an improved power unit in which the motor and the gear case are combined to form a single unit which by means of" a single supporting and sealing device is supported by a base plate secured to the stern of the boat. As a result of such an arrangement, theunit can be easily mounted and detached and, due to the location of the motor close to the stern of the boat, there is obtained a maximum of available space within the boat. t

' The above object and further objects and advantages are attained by the arrangement and combination of parts illustrated in the annexed drawing which shows a partially sectional elevation of an inboard motor power unit constructed in accordance with the invention;

Referring to the drawing, reference numeral 1 denotes the preferably plane stern'board or transom of a motor boat and numeral 2 an opening in the stern. A metallic base plate 3 suitably secured to the outside of the stern such as by means of bolts 4 has a tubular neck portion 5 the external diameter of which closely fits the. opening 2 in the stem 1. Suitable means, not shown, are pro- 1 vided to'eifect a seal between the partsl and 3;

The inboard motor 6 -may be of any suitable type and has a fly-wheel case 7 which merges into asimilar neck portion 8. Neck portion 8 is of smaller diameter than neck portion 5 and is located radially inwardly thereof. The space between the twoflneck portions is occupied by a device constituting an elastically; deformable support for the unit. The neck portion '5 of the base plate 3 has "an internalprojectiori or flange'9 with sloping side faces Patented Apr. ,4, 1961 bevefgearing" 19; a'vertical transmission shaft 20 mnectin'g theqgearing 19 to a second bevel gearing-21 and aj drive'sha'ft. ZZiforthe propeller 23: An oil-circulation pump and, otherauxiliariesnot shown, may also be provided in the gear case 17. i

To steer the boat, the gearrcase 17 is movedhorizontallyfabout'aj vertical axis. To thisend, theiou'tput shaft 15 Oftheniotor andthe shaft 18 "in'the ear case 17 m st 10 be. articulated' to each'other, such as by means; of auniversar oimj provided ,betwr'een said shaft s, in the space between the" neck portions and thegear case 17,.- This space is closed by} nieans'of abellows 25 of rubber or simiIarTmateriaLone end of the bellows being slid onto the neck portion 8 and the other end onto a corresponding projecting portion of the gear case 17 The base plate 3 has a bracket 26 which supports the gear case 17 by means of lugs 27 on the gearcase and a vertical pivot 28 in alignment with the center of the universal joint 24, these parts forming a hinge for the gear case.

In certain cases, it may be desirable to provide an additional support for the motor 6 below the fiy-wheel case 7. As shown in the drawing, a lug 29 secured to the motor casing is connected with a rubber cushion member ing an opening coinciding with the opening in said stern boat. It should also be noted that the construction described facilitates quick exchange of the motor, if necessary.

What I claim is:

'1. In combination with an inboard motor boat having a stern board with an opening therein, a motor within said boat, and a gear case and propeller unit outside said boat on the opposite side of said stern board from said motor; the invention which comprises means for supporting said motor and said gear case and propeller unit solely from said stern board comprising a base plate secured to the outside surface of said stern board and havboard, said motor being operatively connected to said gear case and propeller unit through said stern'board and base plate openings and havinga casing with a neck por-' tion extendinginto the opening in said base'plate, said 1 motor casing neck portion having a circumferential groove A flanged ring .11 is by-means of bolts 10'detachably Y formedbetween the flanged ring 11 and the case 7. The flange 9 of the neck portion 5 projects radially inwardly Theside faces of the groove are Y Insertedinto the annularaspacesbetween associated side faces arefsealing rings .12 and 13-ofrubber, synthetic (resin or similar elastic material.

10 thecon'nection between the necks 5 and 8 isestab 1ished.-i J p M. Q r The neck Shasa wall portion'14 in whichth'e output By tightening the bolts mounted by means of a'bearing a transmission gear'housed in a gear case 17.

' The'gear case '17 maybe conventionally shaped. to cause small "resistance in the 3 water. 3

15 of the motor; a reversible The transmission secured to the neck portion 8 of the motor. The portion a V of the case '7.located near the neck portion 8 is conically shaped such that a substantially "V-shaped groove is in the outer periphery thereof and said base plate having 7 a circular flange adjacent said opening projecting radially inwardly into said groove, elastically deformable supporting members inserted between each of the side faces of said circular flange and the adjacent side walls of the groove in said motor casing neck portion, said base plate having a boss portion extending inwardly through another opening in the stern board, and'an. additional support for said motor comprising engageable cushion and 'abutment'members one. of which is carried by said boss and the other by said motor casing adjacent said stern board. V v a V 7 2. In apower'driven boat having a stern transom; power drive means, and means for supporting said power drive means, saidv supporting means'comprisinga rigid' supporting member rigidly secured'to said boat and havtransom, a rigid sleeve member. secured to said power a 3 outer peripheral face confronting said inner peripheral face, one of said faces having a peripheral groove therein and the other of said faces having a peripheral flange ex- ,tending cooperatively toward said groove, and elastically deformable supporting elements inserted. and compressed between each of the sides of said peripheral flange and the adjacent side walls of the groove to, firmly support said power drive means in the opening in said rigid'supporting'member. i

7 3. Apparatus as defined in claim 2 wherein one side wall of said groove in one of the faces comprises an annular element longitudinally movable relative to the other side wall of said groove, and further including means for displacing said annular element longitudinally toward said other side wall to rigidly clamp said elastically deformable members and said flange between S id ve side walls. t

4. Apparatus as defined in claim 2 wherein said supporting member is secured to said transom and has a neck References Cited the file of this'patent UNITED STATES PATENTS 1,798,596 Fahrney Mar. 31, 1931 

